Shaykh Uthaymīn was asked about the permissibility of giving zakah to a person for medical treatment.
He answered (rahimahullāh):
A person’s need for treatment, is an urgent need. Therefore if we find an ill person who needs treatment and he does not have money to pay for the treatment; then there is no problem in giving him zakah (obligatory charity). Because the intent of it (zakah) is the removal of need.
Shaykh Uthaymīn Majmū’ Fatāwa wa Rasā’il Vol. 18 Pg.342